Outage Performance of Cooperative Underlay Cognitive Radio Relay Based NOMA Networks with Energy harvesting Capability
Subject Areas : Wireless Network
1 - University of Science and Technology of Mazandaran, Behshar, Iran
Keywords: NOMA-Cognitive Network, SIC technique, Network throughput, Convex optimization method, Probability of outage. ,
Abstract :
In this work, Non-orthogonal multiple access (NOMA) technology is considered in cognitive radio (CR) networks in which the secondary users can only access the utilized spectrum of the primary user such that the primary user can tolerate the interference created by the secondary network. On the other words, the combination of CR and NOMA (CR-NOMA) enhances the spectrum efficiency of the network. The energy harvesting relay scheme is also considered such that the proper relay harvests energy from the secondary transmitter while it transmits the data of the secondary transmitter to the corresponding receiver. With this regard, we consider the network throughput improvement in outage behavior and imperfect successive interference cancellation (SIC) at two users. Hence, our proposed problem is maximizing the performance of the network by proper selection of the relay for data transmission of the secondary user, setting the transmission power of the selected relay and optimal power allocation coefficients to each user with constraints on the outage probability and the interference in the primary user communication. We propose an iterative low complexity algorithm using the convex optimization scheme and Karush–Kuhn–Tucker conditions to select the best relay for transmission and users’ power allocation coefficients and setting the transmission power of the selected relay. Simulation results verify our results for improving about 30 percent of the network performance.
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